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The capacitor on LCDCAP only needs to be populated if you are using the LCD charge pump. If the charge pump starts up without a capacitor present, this can damage the device. If you are not using the charge pump, it is recommended to connect this pin to ground. If the charge pump is not turned on, there should not be risk of damage to the device, but current consumption could be higher since you have a floating pin.
Please also note that the LCD_C on this device includes a protection to disable the charge pump if it is started and the LCDCAP is not present. See the LCDNOCAPIFG in the users guide.
